The conservation process of linen mounting involves the poster being mounted onto acid-free paper and then onto linen (similar to artist's canvas). Especially important for fragile posters; this makes the poster easier to handle and display or frame. It also enables any minor restoration of creases, folds, tears or missing pieces. It can only be carried out by professionals.

The term “original poster” refers to a poster being an original issue, or first printing. i.e. produced at the time of the event for promotional or souvenir purposes.Many aspects are considered in determining the originality of a poster including it's size, the look and feel of the paper, print process, colours, printers marks, fold lines, source and sometimes even smell!